Categories:
Numeric Functions (Trigonometric)

ATAN

Computes the inverse tangent (arc tangent) of its argument; the result is a number in the interval [-pi, pi].

Syntax

ATAN( <real_expr> )

Arguments

real_expr
This expression should evaluate to a real number.

Returns

Returns the arc tangent in radians (not degrees) in the range [-pi, pi].

Examples

SELECT ATAN(1);

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   ATAN(1)    |
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 0.7853981634 |
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